#include "ulib.h"

/*
 * Only ever spawned by fifomaster.c, with the shared pipe's handle number
 * as argv[1] (decToString'd -- see fifomaster.c). Sleeps well past when
 * fiforeader.c (spawned moments earlier) will already be parked in a
 * blocking read() on the still-empty pipe, so the write below has to
 * actually wake it back up (schedWakeChannel, pipeWrite in pipe.c) instead
 * of the reader simply finding data already waiting for it -- proof that
 * the block was real, not a lucky race.
 */

#define fifoWriterDelayMs 200

static const char* payload = "shared pipe payload";

int main(int argc, char** argv)
{
    if (argc != 2) {
        print("fifowriter: FAIL expected one argv (pipe handle)\n");
        return 1;
    }

    long handle = parseDec(argv[1]);
    long fd = userPipeAttach(handle, 1);
    if (fd < 0) {
        print("fifowriter: FAIL attach\n");
        return 1;
    }

    print("fifowriter: attached, sleeping before write\n");
    userSleep(fifoWriterDelayMs);

    long written = userWrite((int)fd, payload, stringLength(payload));
    if (written != (long)stringLength(payload)) {
        print("fifowriter: FAIL short/failed write\n");
        return 1;
    }
    print("fifowriter: wrote payload\n");

    userClose((int)fd);
    return 0;
}